In a message dated 2/17/01 9:24:33 PM Pacific Standard Time, xyyc@xxxxxxxx
writes:
>
> Can anyone tell me the extent of the reciprocity failure of K25 at
> exposures greater than one second and whether there is / are any rule[s]
> of thumb to determine the additional exposure time over and above that
> shown by my light meter?
>
> John Hudson
Here's a site that should help:
http://www.photo.net/photo/nature/reciprocity.html
Warren
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